Hey Rune, that's only 5 questions, not over five hundred questions. ta-dump.
Everything said so far has been accurate, but there is one thing that has not been mentioned, probably because most replies come from Europe. The A500+ was never sold in North America, so it is a PAL machine with a 220V/50Hz power supply. I have one that was brought in from the UK, so it has the lb. on the keyboard, and I use it with a GVP A530 sidecar accelerator and a 1084S monitor. I happened to have NA power supplies for both the GVP and the A500, so no problem there, and I never tried to use a (NTSC) TV as a monitor.
I'm not sure this is valid for A500+.
There are at least 2 separate Fatter/Super-Agnus chips which support PAL or NTSC at boot time. Those chips are supported by adequate clock oscillators. Considering those 2 facts one could easily conclude those are hardwired options not prone for a easy change.
True, but not ultimately necessary. Since A500+ is ECS machine, that means video modes are software controllable, you can switch modes after boot time or even directly at early boot menu.
Regarding PSU, it doesn't matter much for NTSC; A500 will accept any switched or non-switched AC-to-DC PSU as long it provides +5VDC, +12VDC, -12VDC, irrespective if input voltage is 230 or 110V.
